How to Avoid Defects of PCB Design

Dated:2018-01-24      Popularity:1191

DC/DC and LDO working principleDC/DC and LDO are often used in electronic products, but what is the difference between them, and how to choose to avoid the shortcomings of PCB design?

DC/DC converts one DC input voltage into another DC output voltage, such as boost, buck, buck-boost and inverting structure. LDO, as an abbreviation for low dropout voltage regulator, is a low dropout linear regulator. They all stabilize an input voltage to a certain voltage, and the LDO can only be used as a buck output. The parameter is the main concern when selecting a power chip.

a.The output voltage. DC/DC output voltage can be adjusted through the feedback resistor, while LDO has two types-- the fixed output and adjustable output.

b.Dropout voltage. Dropout voltage is an important parameter for LDO. Since the LDO output current is equal to the input current, the smaller the dropout voltage, the smaller power consumption of the internal chip, and the higher the efficiency.

c.Maximum output current. Generally, LDO maximum output current can reach hundred mA, while DC\DC maximum output current can be a few A or more.

d.Input voltage. Different chips have different requirements for input voltage.

e.Effectiveness. If the input voltage is close to the output voltage, choose LDO is relatively more efficient than DC/DC; if dropout voltage is big, then choose DC/DC is better, because LDO output current and input current are basically equal, thus the big pressure drop will cause huge power consumption.

f.Cost. LDO is much cheaper than DC/DC, because its peripheral circuits are simple.

The above parameters are the top priority when designing, you can have a try in your new PCB product design.

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